Often misspelled as SNOWBOARDER, a person who straps themself to one board (while everyone knows two are better) and procedes to slide down a snow covered slope on it. Slowboarders abide by Murphy's law as seen when you, who know what you are doing, are going down a mountain, and they materialize in front of you, causing a crash of you, him/her/it, or both.
Also like to sit down in the middle of a good run, obstructing and ruining it.
Commonly confused with picnickers, idiots, morons, wanksters, retards, or fags

DAMMIT! That slowboarder ruined my run again by getting in my way and now my lift ticket is suspended.